Cell Phones With Built In Sonars

I'm pretty sure that they are building cell phones with built in sonars and proximity sensors.
I seen 3 people already walking with their phones, not looking where they are going, and just texting away.
One girl is that even maneuvered going straight, turning, went up some stairs, and then turned, kept on going up the next flight of stairs, then did a 45 degree angle and kept on going! All the while not taking her eye off her phone.
Amazing technology!

My sister commutes to the city of Chicago for work. On the train, over the loudspeaker, passengers always hear, "Stop walking in front of the trains." People, possibly some on cellphones, get hit and killed by trains all the time.